{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nProgrammed cell death 5 (PDCD5) has emerged as a multifunctional modulator of cellular homeostasis, notably through its regulation of p53‐mediated apoptosis. Under genotoxic stress conditions, PDCD5 facilitates the dissociation of histone deacetylase 3 (HDAC3) from p53, leading to HDAC3 cleavage and its subsequent ubiquitin‐dependent degradation. In addition, the interaction with YY1‐associated factor 2 stabilizes PDCD5 and ensures effective TP53 activation, thereby promoting apoptosis as an adaptive response to cellular stress."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its role in apoptosis, PDCD5 contributes critically to immune regulation. It interacts with FOXP3 and, together with Tip60, enhances FOXP3 acetylation and stability, thus promoting the differentiation and suppressive function of regulatory T cells. Moreover, PDCD5 is essential for the terminal maturation and lineage commitment of invariant natural killer T (iNKT) cells, in part by stabilizing transcription factors that facilitate T‐bet expression early in iNKT cell development."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nPDCD5 also plays multifaceted roles in tissue remodeling and fibrotic responses. In pulmonary fibrosis, increased expression of PDCD5 in club cells induces β‐catenin/Smad3 complex formation and TGF‐β–mediated transcription of matricellular genes, thereby contributing to fibrotic pathology. In the heart, overexpression of PDCD5 enhances basal autophagy and suppresses apoptosis, protecting against β‐adrenergic–induced cardiac hypertrophy and fibrosis. In the vasculature, PDCD5 modulates endothelial function by interfering with HDAC3–AKT interactions, which in turn affects downstream eNOS phosphorylation and nitric oxide production, with implications for atherosclerosis. Furthermore, in the setting of cerebral ischemia, knockout studies reveal that loss of PDCD5 protects against ischemic injury by maintaining VHL levels and attenuating hypoxia‐induced apoptotic and autophagic cascades. Finally, genetic deletion of PDCD5 in mouse embryos leads to defective placental development, impaired growth factor signaling through the Pik3ca–Akt–mTOR cascade, and embryonic lethality, underscoring its pivotal role in embryogenesis."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "5", "end_ref": "9"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its roles in apoptosis, immunity, and tissue remodeling, PDCD5 participates in age‐related and metabolic processes. Its expression progressively increases in cochlear hair cells and spiral ganglion neurons with aging, an effect accompanied by enhanced caspase‐3 activity and apoptosis that contributes to presbycusis. Moreover, PDCD5 is widely expressed in tissues such as skeletal muscle, where emerging studies suggest it may influence insulin resistance, a key determinant of metabolic syndrome."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "10", "end_ref": "12"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nFinally, PDCD5 appears to modulate pathological processes in inflammatory and neoplastic diseases. Increased serum PDCD5 levels have been observed in allergic asthma, implicating it in the regulation of inflammatory responses. In the context of erythroleukemia, the TFAR19 gene, functionally linked to PDCD5, diminishes disease severity—an effect that is augmented in the presence of chemotherapeutic agents—highlighting the potential of targeting PDCD5‐associated pathways for therapeutic intervention."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "13"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Hyo-Kyoung Choi, Youngsok Choi, Eun Sung Park, et al. 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